Knowledge base

USB Cable Maximum Length - PD Charging considerations 

USB Power Delivery (PD) standard recommended below length for USB cables

*reference from USB standard

So how long can a USB-C cable be? USB-IF, which is the USB Implementers Forum, has guidelines on USB cable length (Table 3-1, pg. 37, pictured below) based on the transfer rate. It dictates that USB 3.1 Gen 1 (5 Gbps) cables should be at most 2 meters, while USB 3.1 Gen 2 (10 Gbps) cables can reach up to 1 meter. That’s around 3 feet. Though not widely used for data transfer, USB 2.0 cables can be up to 4m long due to their slow transfer rate of 480 Mbps.

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